Dust-collecting system.



QATENTED MAR. 12, 1907.

W. E. ALLINGTON. DUST COLLECTING SYSTEM.

APPLICATION FILED JULY 26,1906.

. i a u F'PFZ Finis-Lib it WILLIAM E. ALLINGTON,

Application filed July To all whom it may concern:

Be it known that I, VVILLIAM E. ALLING- 3 TON, a citizen of the United States, residing at Saginaw, 1n the county of Saginaw and State of Michigan, have invented certain new and useful Improvements in Dust-Col '1 lectmg Systems, of which the following is a 1 specification.

My invention relates to improvements in material-conveying pneumatic systmns, and has for its primary ObJOGlZ to provide system wherein air and material are conveyed through curved paths with high economy or a minimum expenditure of energy.

To this end my system contemplates the provision, in association with a "an and straight piping, of piping curves, bends, or

elbows of configuration and proportion pro-- j ductive of minimum loss of energy in changing the direction of flow of the air and mate 7 rial 1n passage therethrough.

In the drawings, wherein I have ihlstrater an embodiment of my invention, Figure 1 is a plan view of a part of a material-coiweying system. Fi 2 is a section in plane of the curve of an elbow forming a part of said system. Fig. 3 is an end view of said elbow,

and Figs. 4 and 5 are transverse sections through the elbow on lines 4 4 5 5 of Fig. 2.

Throughout the drawing like numerals of pipes 12, which lead to diil'erent areas of air 1 and material supply.

13 Indicates an air-delivery pipe leading from the mouth of the fan, for example, to a f dustcollector. (Not shown.)

In any one of the pipes of the.

Wherever change of direction is necessary I provide an elbow of special construction,

generally indicated at. 1 -1.

let extremities which aline with and. are of area equal to the straight pipes to be joined and intermediate the terminal radii oi the curve an area in excess of the inlet and outlet areas of the elbow. Further, such elbow is preferably formed to present in section a suctrons stem In general each such special elbow or bend pr rides beyond the'termmal radii of the bend inlet and out- 1 Uflldo OF SAGIl lAl V, INHCHIGIQI.

"tests $a 'i'fi l iiit h Letters Patent.

906. Serial No. 327,804.

IPa'tented March 12, 19%7.

sharp angles, preferably in ovate shape, having its major axis transversely disposed relative to the plane of the elbow. I

in practice i prefer to construct the elbow of several. pieces, usually five in number, comprising end members l5 15, each ar ranged to aline with the straight piping to be connected and at its extremity round. in sectron, each said section being bent or swaged to oval i'rn between its extremity and its juncture with the intermediate pipe-sections 16 16, and said intermediate sections being arranged in overlapping relation to'present in the aggregate a curve, best illustrated in Fig. 2. The curve-sections 16 are prefer ably secured together by riveting at suitable I points and. are ar'anged to overlap in such direction that the air in transit therethrough meets with no obstruction the transverse joints, the circumferential joints of each curve-section being preferably arran 'ed at a point which leaves clear and unbro lren the exterior sweep of the curve.

While for the handling of material I deem CGlQ'lilIZllOUS GUN/'6 VFil/ilOlli) l 4 l l to be advantageous, it will be apparent that some of the advantagesincident to my inveni tion will be preserved should the sections of l the curve be made round in cross-section. 1 l have found that the loss oi power and lenergy due to deflecting material and air l through elbow in a materiahhandling l pneumatic system is greatly reduced or, conversely, that the cfiilciency oi the system is 1 great increased by the of elbows of the l' character and construction. described.

It is well known that an increase in the area 1 of a pipe be tween its ends produces a reduction of the velccit oi the air in flow through the enlarges. section below the velocity in g the section of standardarea. Thus in the elbows of area the velocity of the air is decreased, its momentum lessened, and inevitably the energy required to change the direction or ilow of the air is diminished. I l find in practice that I can make a ninety deg ee bend without appreciable loss, whereas eiiecting lil-ic turnof the air in 1 cent. (30%) of the energy results, and l a so find that, contrary to the old practice, I can use a short radius elbow, as shown, without detriment. Furthermore, it will be observed that by using an elbow of ovate section with its major axis transverse to the plane of the the oval configuration oi the curve described the oldv uniform area elbows a loss of ten er curve 1 provide at the outside of the curve a transverse surface of increased idth or longer radius which affords room for the materiel in psssege to mass in e thinner layer under the influence of the centrifugal action attendant upon rounding the curve. For this reason i prefer to employ in me terial hendling installations elbows of the" section illustrated in the drawing, although for handling sir alone curved sections round in cross-section mi ht be employed.

For purposes of ll disclosure I stste that I have in practice found that by increasing the sectionel ares in the curve twenty-five (25%) per cent. over the arcs of the straight piping ll am enabled to produce e large savmg; but it will be understood that I do not desire to limit myself to the exact proportions of the curve enlargements relative to the straight piping area. I

While l have herein described in some detail a specific embodiment of my invention, which experience has proven advantageous, it will be understood that changes might be made in the physical structure Without departure fromthe spirit and scope of my invention. v

Heving thus described my invention, Wha I claim,- eiid desire to secure by Letters Patent of the United States, is"

l. In a system of the character described, the combination with a fen, of a pipe communicating therewith, said pipe com rising straight sections and an interposed el ow or ecee ze band, led elbow or bend being in traps erse cross-section, curved throughout, and of area greater then the sectional area of'the straight sections. where'with it communicates, the dimension of such section on. an axis in the l" lane of theben'd be" lion on an axis 'plahe.

2, of the cherecter described, the com with e fan, of a pipe communicating there:

with, and comprising straight sections, and

than. its

v not an interposed elbow, seid elbow being of a. right angles tosuch In a material arid air heridlin%)system instion.

transverse sectional area, in excess of the area of the straight'sections Wherewith it communicates, end of cross-section ovate in configuration with its major axis transverse; to the plane of the elbow.

3. In a system of the character the combination with. e fan, of a. pipefiome municating therewith, said pipe comprise ing an elbow or bend structure having straight circular ends, and an, intermediate longitudinal bend of sectional area greets! than the end areas and of diameter at angles to the plane of the bendgreater tlmh l6).

the diameter of the ends. In testimony whereof I hereunto set hand in the presence of two Wituesses.

WILLIAM E. ALLiNeToN.

In presence of GEO. T. MAY, Jr,

MARY F. AL EN. 

